Gurtubay, I. G. and Drummond, Neil and Towler, M. D. and Needs, R. J. (2006) Quantum Monte Carlo calculations of the dissociation energies of three-electron hemibonded radical cationic dimers. Journal of Chemical Physics, 124 (2).Full text not available from this repository.
We report variational and diffusion quantum Monte Carlo (VMC and DMC) calculations of the dissociation energies of the three-electron hemibonded radical cationic dimers of He, NH3, H2O, HF, and Ne. These systems are particularly difficult for standard density-functional methods such as the local-density approximation and the generalized gradient approximation. We have performed both all-electron (AE) and pseudopotential (PP) calculations using Slater-Jastrow wave functions with Hartree-Fock single-particle orbitals. Our results are in good agreement with coupled-cluster CCSD(T) calculations. We have also studied the relative stability of the hemibonded and hydrogen-bonded water radical dimer isomers. Our calculations indicate that the latter isomer is more stable, in agreement with post-Hartree-Fock methods. The excellent agreement between our AE and PP results demonstrates the high quality of the PPs used within our VMC and DMC calculations.
|Journal or Publication Title:||Journal of Chemical Physics|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited On:||10 Jul 2012 09:35|
|Last Modified:||26 Jul 2012 20:40|
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